knot weed problem
I have knot weed growing into my yard from the boarding woods. I have tried spraying roundup on the plants, but they seem to be resistant. I have also tried to pull the weeds and roots, but that is a fruitless battle. What can I do to get rid of them?
Howard County Maryland
This plant can be difficult to control and is invasive.
Here is information from one of the best resources available http://www.nps.gov/plants/alien/fact/faja1.htm
As it mentions, to be sure that the herbicide adheres to the leaf well, mix a surfactant with the herbicide. (It makes it stickier.)
Take a look at our video on knotweed https://www.youtube.com/watch?v=UnxVZRgN_qU&index=3&list=PL942C7AED5F1D72A7